German police have arrested two Algerians they suspect of links to the "Islamic State" (ISIS) terrorist group and are hunting for two others in operations in Berlin and other regions, they said Thursday.
The four "from the jihad scene are under investigation over suspicions that they are planning a serious act threatening the security of the state", Berlin police told AFP.
One of the two arrested is sought by Algerian authorities for his links to ISIS, police said.
"Investigations show that he has been trained militarily in Syria," they said in a statement.